void closePreview( bool theRemoveViewManager = true );
void setObjectVisibility( Handle(HYDROData_Entity) theEntity, const bool theIsVisible );
void setZonesVisible( bool theIsVisible );
void closePreview( bool theRemoveViewManager = true );
void setObjectVisibility( Handle(HYDROData_Entity) theEntity, const bool theIsVisible );
void setZonesVisible( bool theIsVisible );